|ICAO is discussing a global MBM scheme for international aviation and is expected to reach an agreement on it in the assembly this year. However, there are still significant differences in the positions of states, and the draft resolution text under discussion unduly restricts the number of participating states in the scheme and achieves only part of the environmental goals of ICAO. Moreover, major developing states, such as China, India, and Brazil oppose the draft text so strongly that not only passing the assembly, but also the preparation process after the assembly could face great difficulty. In order to resolve these problems, this study suggested a new methodology to include all airlines regardless of nationality, of which emissions from international aviation are over a certain threshold, and allocate obligations by applying a ‘sectoral offset rate’ to all participating airlines. In this methodoloy, airlines submit the costs for buying certain percentages of emission units for their obligations to states and offset only the remaining percentages of units, with submission rates decided by the states. States decide the rates autonomously within a maximum of 30%, taking into account their special circumstances and respective capabilities. States use the revenues from airlines for their national GHG emissions reduction projects and report the reduced amounts to ICAO for statistical purposes. This study also estimated the impact of the new methodology. With this methodology, an agreement on global MBM at the assembly would be easily reached, because all stated issues can be resolved, and the environmental goal can be achieved closely than the draft text.